Gaya APA
Teo, G, W, L.
(2007).
Science 4A: Workbook
(
4A SD)
.
Singapore:
Federal Marshall Cavendish Education.
Gaya MLA
Teo, Gwan, Wai, Lan,.
"Science 4A: Workbook".
4A SD
Singapore:
Federal Marshall Cavendish Education,
2007.
.